14 Best 20 Ton Low Profile Bottle Jacks for 2026

Choosing a 20-ton low-profile bottle jack for 2026 starts with your vehicle’s clearance, required lift height, and preferred power source. The Big RED ATH92007AR offers a 6½-inch starting height, while the VEVOR spans 6.69 to 12.6 inches.
Need faster lifting? Consider air/manual options like the Astro 5304A or Yellow Jacket AS20N. Compare safety features, screw extensions, and portability before you buy; the models and useful selection tips ahead will help you find a suitable match.
| Big RED 20-Ton Low-Profile Hydraulic Bottle Jack (ATH92007AR) | ![]() | Best Low-Profile Pick | Jack Type: Hydraulic bottle jack | Capacity: 20 ton | Brand: BIG RED | VIEW LATEST PRICE | Read Our Analysis |
| Pro-Lift Hydraulic Bottle Jack 20 Ton | ![]() | Best For Portability | Jack Type: Hydraulic bottle jack | Capacity: 20 ton | Brand: Pro-Lift | VIEW LATEST PRICE | Read Our Analysis |
| Astro 5304A 20 Ton Low Profile Air/Manual Bottle Jack | ![]() | Best Air-Powered Pick | Jack Type: Air/manual bottle jack | Capacity: 20 ton | Brand: AP | VIEW LATEST PRICE | Read Our Analysis |
| VEVOR 20-Ton Low-Profile Hydraulic Bottle Jack | ![]() | Best Height Range | Jack Type: Hydraulic bottle jack | Capacity: 20 ton | Brand: VEVOR | VIEW LATEST PRICE | Read Our Analysis |
| 10-Ton Double Ram Low-Profile Bottle Jack | ![]() | Best Ultra-Low Profile | Jack Type: Double-ram low-profile bottle jack | Capacity: 10 ton | Brand: Jack Boss | VIEW LATEST PRICE | Read Our Analysis |
| Big RED 20-Ton Hydraulic Bottle Jack with Dual Power | ![]() | Best Dual-Power Pick | Jack Type: Dual-power hydraulic bottle jack | Capacity: 20 ton | Brand: BIG RED | VIEW LATEST PRICE | Read Our Analysis |
| Torin 10-Ton Double Ram Low Profile Bottle Jack (ATH810002R) | ![]() | Best Compact Lift | Jack Type: Double-ram low-profile bottle jack | Capacity: 10 ton | Brand: BIG RED | VIEW LATEST PRICE | Read Our Analysis |
| Stark USA 20-Ton Low-Profile Hydraulic Bottle Jack | ![]() | Best Manual Backup | Jack Type: Air/hydraulic bottle jack | Capacity: 20 ton | Brand: Stark USA | VIEW LATEST PRICE | Read Our Analysis |
| Big RED 20-Ton Heavy-Duty Hydraulic Bottle Jack | ![]() | Best Heavy-Duty | Jack Type: Hydraulic bottle jack | Capacity: 20 ton | Brand: BIG RED | VIEW LATEST PRICE | Read Our Analysis |
| Yellow Jacket 20-Ton Multi-Directional Hydraulic Bottle Jack | ![]() | Best Multi-Directional | Jack Type: Multi-directional hydraulic bottle jack | Capacity: 20 ton | Brand: YELLOW JACKET | VIEW LATEST PRICE | Read Our Analysis |
| 20-Ton Low Profile Air Hydraulic Bottle Jack | ![]() | Best Professional Grade | Jack Type: Air-hydraulic bottle jack | Capacity: 20 ton | Brand: ESCO | VIEW LATEST PRICE | Read Our Analysis |
| YELLOW JACKET 20-Ton Low-Profile Air Bottle Jack | ![]() | Best Air-Manual Versatility | Jack Type: Air-hydraulic bottle jack | Capacity: 20 ton | Brand: YELLOW JACKET | VIEW LATEST PRICE | Read Our Analysis |
| VEVOR 20-Ton Air Hydraulic Bottle Jack | ![]() | Best For Quick Lifts | Jack Type: Air-hydraulic bottle jack | Capacity: 20 ton | Brand: VEVOR | VIEW LATEST PRICE | Read Our Analysis |
| Omega 10208 Black Shorty Hydraulic in-Line Bottle Jack – 20 Ton Capacity | ![]() | Best In-Line Design | Jack Type: Hydraulic in-line bottle jack | Capacity: 20 ton | Brand: Omega Lift Equipment | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Big RED 20-Ton Low-Profile Hydraulic Bottle Jack (ATH92007AR)
The Big RED ATH92007AR is a strong low-profile pick for residential and commercial users who need 20-ton capacity with a 6½-inch starting height. Its lifting range runs from 6½ to 11¼ inches, giving you stubby access where taller jacks may not fit. Its serrated, heat-treated saddle provides a generous contact area and secure grip.
Drop-forged alloy steel construction and welded inner and outer structures support durability and leak-free performance. The glide-action pressure pump helps you lift with minimal effort, while the oil-bypass system manages hydraulics and an overload valve helps protect the system. Use the adjustable screw-top extension to add reach. For residential or commercial lifting, this jack pairs low clearance with substantial capacity. You also get a one-year limited manufacturer warranty.
- Jack Type:Hydraulic bottle jack
- Capacity:20 ton
- Brand:BIG RED
- Model:ATH92007AR
- Color:Red
- Hydraulic System:Hydraulic
- Additional Feature:6½–11¼-inch lift range
- Additional Feature:Serrated heat-treated saddle
- Additional Feature:One-year limited warranty
Pro-Lift Hydraulic Bottle Jack 20 Ton
Pro-Lift’s 20-ton B-S20D suits mobile mechanics who need a heavy-duty jack with an integrated handle for easier transport. You can use its 20-ton capacity for auto or truck service, farm work, and shop jobs. The steel lifting saddle helps hold your load securely, while the adjustable extension screw lets you set the working height for different lifting tasks.
Built-in bypass protection guards against ram overtravel, and heat-treated stress areas support durability under heavy loads. Pro-Lift says it meets latest ANSI/PALD standards, giving you reassurance about quality and safety. Its handle also makes moving the jack between work areas simpler.
- Jack Type:Hydraulic bottle jack
- Capacity:20 ton
- Brand:Pro-Lift
- Model:B-S20D
- Color:Grey
- Hydraulic System:Hydraulic
- Additional Feature:ANSI/PALD standards compliant
- Additional Feature:Integrated carrying handle
- Additional Feature:Heat-treated stress areas
Astro 5304A 20 Ton Low Profile Air/Manual Bottle Jack
For shops seeking an air-powered pick, the Astro 5304A switches between pneumatic and manual operation for flexible lifting.
You can use air/hydraulic power for faster operation than conventional hand-operated hydraulic jacks, or switch to manual control. At the air-source connection, the hose swivels in any direction, helping you route it around equipment.
A safety valve is designed to protect against overload, while the extension screw gives you added height when needed. For two modes and adjustable reach, this Astro model brings those features together in a 20-ton bottle jack. Check its fit with your vehicle and lifting points before use.
- Jack Type:Air/manual bottle jack
- Capacity:20 ton
- Brand:AP
- Model:5304A
- Color:Red
- Hydraulic System:Air/hydraulic
- Additional Feature:Air and manual operation
- Additional Feature:Swiveling air-hose connection
- Additional Feature:Overload safety valve
VEVOR 20-Ton Low-Profile Hydraulic Bottle Jack
VEVOR’s 20-ton jack offers a 6.69–12.6-inch lifting range for vehicles with varying chassis heights. You can use its 2.4-inch screw adjustment to fine-tune contact, then lift cars, pickups, trucks, SUVs, or RVs for tire changes and repairs. Its capacity reaches 44,092 pounds, while a three-section handle gives you extra leverage and stores compactly in your trunk or garage.
The welded hydraulic design features sealed connections to help prevent leaks and performs in temperatures from -13°F to 140°F. An overload valve helps protect against exceeding capacity; don’t adjust the safety valve. Measuring 6.3 by 5.9 by 6.7 inches, this orange VEVOR model suits automotive and industrial work.
- Jack Type:Hydraulic bottle jack
- Capacity:20 ton
- Brand:VEVOR
- Model:QJD-020S-01
- Color:Orange
- Hydraulic System:Hydraulic
- Additional Feature:6.69–12.6-inch lift range
- Additional Feature:Three-section lifting handle
- Additional Feature:−13°F to 140°F operation
10-Ton Double Ram Low-Profile Bottle Jack
Jack Boss’s AS810002 suits ultra-low-clearance jobs, with a 4.92-inch retracted height for tight access. Its double-ram design gives you a lift range of 4.92 to 8.46 inches, combining a low starting point with extra extension compared with common bottle jacks. Rated for 10 tons (20,000 pounds), it’ll serve you when working on trucks and SUVs.
Corrosion-resistant hydraulic oil supports use across temperatures from -13°F to 140°F, and a one-year limited manufacturer warranty adds coverage. Check the jack’s rated capacity against your vehicle and follow safe lifting practices; this model is a 10-ton option, not a 20-ton jack.
- Jack Type:Double-ram low-profile bottle jack
- Capacity:10 ton
- Brand:Jack Boss
- Model:AS810002
- Color:Red
- Hydraulic System:Hydraulic
- Additional Feature:4.92-inch minimum height
- Additional Feature:Double-ram design
- Additional Feature:Corrosion-resistant hydraulic oil
Big RED 20-Ton Hydraulic Bottle Jack with Dual Power
BIG RED’s dual-power design suits drivers who need air-powered speed and manual control from one low-profile jack. Switch between air power for quick lifts and manual control. Its 20-ton (40,000-pound) capacity handles automotive repairs and work. The jack spans 7-1/16 to 12-5/8 inches, letting you tackle brake jobs or align machinery.
An adjustable screw pad steadies uneven surfaces, while dual springs help you lower loads. The welded steel body, leak-preventing seals, overload valve, and corrosion-resistant coating support durability and safer use. At 15% lighter than competitors, it’s easier to carry under low-clearance vehicles. Foam-padded packaging protects it, and ASME testing adds confidence.
- Jack Type:Dual-power hydraulic bottle jack
- Capacity:20 ton
- Brand:BIG RED
- Model:AQYL20R
- Color:Red
- Hydraulic System:Hydraulic with air-power capability
- Additional Feature:Air and manual operation
- Additional Feature:ASME standards tested
- Additional Feature:Corrosion-resistant coating
Torin 10-Ton Double Ram Low Profile Bottle Jack (ATH810002R)
The Torin ATH810002R is a compact lift for trucks and SUVs with tight clearance. Its double-ram design gives you a 4.92-inch minimum height and extends to an 8.46-inch maximum, offering more range than many standard bottle jacks. You can use its 10-ton (20,000-pound) capacity for suitable lifting tasks, but confirm your vehicle’s weight and approved lift points before use.
The ultra-low profile helps when you’re working beneath vehicles with limited clearance. Torin fills it with specialized hydraulic oil to support corrosion resistance and operation from -13°F to 140°F. A one-year limited manufacturer warranty adds useful coverage.
- Jack Type:Double-ram low-profile bottle jack
- Capacity:10 ton
- Brand:BIG RED
- Model:ATH810002R
- Color:Blue
- Hydraulic System:Hydraulic
- Additional Feature:4.92-inch minimum height
- Additional Feature:Double-ram design
- Additional Feature:−13°F to 140°F operation
Stark USA 20-Ton Low-Profile Hydraulic Bottle Jack
For drivers who need a dependable manual backup, Stark USA’s 20-ton jack includes two detachable handles. It also offers air lifting through the included hose and quick-connect fitting so you can use a compressor when available. Its 44,000-pound capacity supports most vehicle repair lifting tasks. The jack raises loads from 10¼ inches to 20 inches, giving you useful clearance while keeping its profile low.
Heavy-duty steel construction helps it withstand repeated use with less wear. Side handles make carrying it to job sites easier, and the handle support aids movement. If you can’t reach an air compressor, manual operation remains available.
- Jack Type:Air/hydraulic bottle jack
- Capacity:20 ton
- Brand:Stark USA
- Model:50504-1
- Color:Red
- Hydraulic System:Air/hydraulic
- Additional Feature:10¼–20-inch lift range
- Additional Feature:Air-compressor connection included
- Additional Feature:Detachable manual handles
Big RED 20-Ton Heavy-Duty Hydraulic Bottle Jack
Built for demanding repairs, the Big RED AT92007BR suits drivers who need heavy-duty lifting capacity for cars, trucks, or SUVs.
At 20-ton capacity (44,000 pounds), you can tackle demanding auto repairs or house lifting. Its 7.56-to-14.05-inch lift range and adjustable screw-top extension help you match different lifting needs. The blue jack weighs 25.35 pounds and measures 6.7 x 6.4 x 7.56 inches.
Built from thick drop-forged alloy welded steel, it uses precise welding for leak-free performance. A safety-tested design includes an oil bypass and secure valve to protect the hydraulic system during overload conditions. You’ll also get a one-year limited manufacturer warranty.
- Jack Type:Hydraulic bottle jack
- Capacity:20 ton
- Brand:BIG RED
- Model:AT92007BR
- Color:Blue
- Hydraulic System:Hydraulic
- Additional Feature:7.56–14.05-inch lift range
- Additional Feature:Drop-forged alloy steel
- Additional Feature:One-year limited warranty
Yellow Jacket 20-Ton Multi-Directional Hydraulic Bottle Jack
Yellow Jacket’s 20-ton multi-directional design suits you if you need versatile lifting for cars, pickups, trucks, or RVs. Its 20-ton (40,000-pound) capacity and welded bottle-jack construction give you a versatile option for auto repair, including horizontal lifting when your setup calls for it.
The stated lifting range is 9¼ to 17½ inches for smaller vehicles, so check your vehicle’s clearance and lift points before use.
A serrated, heat-treated saddle gives you a broad, secure contact area for efficient lifting. High-quality steel, durable welds, leak-resistant sealing, and built-in safety features support dependable use; its bottom valve balances internal air pressure.
- Jack Type:Multi-directional hydraulic bottle jack
- Capacity:20 ton
- Brand:YELLOW JACKET
- Model:AS92004C
- Color:Yellow
- Hydraulic System:Hydraulic
- Additional Feature:Horizontal operation capability
- Additional Feature:Serrated heat-treated saddle
- Additional Feature:Pressure-balancing bottom valve
20-Ton Low Profile Air Hydraulic Bottle Jack
The ESCO 10399 brings professional-grade appeal to technicians who need a 20-ton low-profile air-hydraulic bottle jack. Its yellow finish makes the model easy to identify in your lineup. As you compare options for demanding lifting tasks, consider whether its low profile suits your available clearance and whether an air-hydraulic system fits your setup.
ESCO lists this model with a 20-ton lifting capacity, but the provided specifications don’t detail operating pressure, lift range, minimum height, or included accessories. Check those details before purchase to confirm compatibility with your vehicle and intended use. For an ESCO option, consider the 10399.
- Jack Type:Air-hydraulic bottle jack
- Capacity:20 ton
- Brand:ESCO
- Model:10399
- Color:Yellow
- Hydraulic System:Air/hydraulic
- Additional Feature:Yellow finish
- Additional Feature:Model 10399
- Additional Feature:Low-profile design
YELLOW JACKET 20-Ton Low-Profile Air Bottle Jack
For drivers and repair shops needing air-manual versatility, the YELLOW JACKET AS20N offers dual lifting modes and 20-ton capacity. Its low-profile design fits practical under-vehicle lifting, with a range from 7-1/16 to 12-5/8 inches. You can lift manually with the two-handle connection or press the pneumatic switch for air-powered operation. The included hose and 20 PM connector connect quickly to an air compressor, while the aluminum alloy pump supports efficient lifting.
Heavy-duty steel construction, safety valves, and double springs help provide stable lifting and a fast reset. You’ll also get a one-year warranty and access to professional customer service for usage questions.
- Jack Type:Air-hydraulic bottle jack
- Capacity:20 ton
- Brand:YELLOW JACKET
- Model:AS20N
- Color:Yellow
- Hydraulic System:Air/hydraulic
- Additional Feature:Manual and pneumatic modes
- Additional Feature:Aluminum alloy pump
- Additional Feature:Heavy-duty double springs
VEVOR 20-Ton Air Hydraulic Bottle Jack
Air-powered lifting makes quick lifts easy with VEVOR’s 20-ton jack, a fit for truck, RV, and SUV owners. You can connect its quick-connect fitting for tire changes or inspections, then switch to the manual handle when air isn’t available. It supports up to 44,092 pounds and lifts from 10.2 to 19.5 inches; 2.6 inches of screw travel helps you fine-tune height in tight-clearance spots.
Cast iron and carbon steel form a body, while aluminum cylinder seals, an overload valve, and a leak-resistant oil port support dependable use. Dual springs reset the piston, and its oil resists freezing and seal swelling in extreme temperatures.
- Jack Type:Air-hydraulic bottle jack
- Capacity:20 ton
- Brand:VEVOR
- Model:QJD-Q01-020A
- Color:Orange
- Hydraulic System:Air/hydraulic
- Additional Feature:10.2–19.5-inch lift range
- Additional Feature:Pneumatic and manual operation
- Additional Feature:Dual-spring piston reset
Omega 10208 Black Shorty Hydraulic in-Line Bottle Jack – 20 Ton Capacity
Omega’s 10208 pairs a compact shorty build with an in-line hydraulic layout, making it a strong pick when space is tight. With a 20-ton capacity and a 7.75-by-5-inch footprint, it suits automotive lifting tasks where you need substantial capacity without a bulky jack. Its hard-cast-steel body has heat-treated stress areas, while machined, polished cylinders and die-cut threads support durable, leak-resistant operation.
A bypass mechanism protects the hydraulic system from internal damage. You also get forged cross-type release valves for positive load control and overload protection. If you need a compact, heavy-duty option, this black Omega jack offers a focused set of practical safeguards.
- Jack Type:Hydraulic in-line bottle jack
- Capacity:20 ton
- Brand:Omega Lift Equipment
- Model:10208
- Color:Black
- Hydraulic System:Hydraulic
- Additional Feature:Heat-treated stress areas
- Additional Feature:Forged cross-type release valves
- Additional Feature:Positive load control
Factors to Consider When Choosing 20-Ton Low-Profile Bottle Jacks
When choosing a 20-ton low-profile bottle jack, match its lifting capacity and minimum and maximum heights to your vehicle and work space. Compare jack types and power sources, then check build quality and seals for reliable operation.
You’ll also want safety features such as overload protection.
Lifting Capacity
Choose a jack rated to lift 20 tons (40,000 lb), and leave a margin between that rating and your vehicle’s weight so the jack doesn’t work near its limit. Treat 20 tons as the maximum safe load under normal operation, not a target to approach routinely. Compare the rating with the weight you’ll lift and leave a buffer for changing load conditions.
An overload-protection or bypass valve can help keep the hydraulic system within safe limits. Confirm the manufacturer supports the rated capacity in your intended use, and choose reinforced construction with heat-treated stress areas for repeated service. Check specifications and follow operating instructions; never exceed the rating or rely on a jack alone to support a raised vehicle during routine shop service, either.
Minimum and Maximum Height
A 20-ton low-profile bottle jack’s height range determines both whether it fits beneath your vehicle and how high it can raise it.
Check retracted height first: it’s the lowest point where lifting can begin. Ultra-low models may stand 4.92 inches; others measure about 6.5 to 7.6 inches. Compare this with your vehicle’s chassis clearance.
Then assess maximum height. Compact designs may reach roughly 8.46 inches, while higher-travel models can extend to about 20 inches.
Choose a range that provides the working height you need for tire changes, part removal, or inspections, not just clearance to start. A screw extension or pad travel may offer 2.4 to 2.6 inches of fine adjustment, helping you position the load. Ensure the vehicle can be safely supported below the jack’s maximum height.
Jack Type and Power
Once you’ve confirmed the jack fits and reaches your vehicle, consider how you’ll power it. A manual hydraulic model relies on hand pumping, so it suits work without compressed air. An air-hydraulic jack uses an air connection and powered pump for quicker lifting with less manual pumping. Check that its quick-connect fits your compressor and that the hose can reach.
A dual-power model gives you pneumatic quick lift plus manual backup, helping you work in a shop or where air isn’t available. Confirm you can switch between air and hand operation, and look for controls such as a pneumatic lift switch and manual handle. Match the operating mode to your workspace and workflow; convenient controls can make positioning and raising the load more practical.
Build Quality and Sealing
Under repeated 20-ton loads, a jack’s construction and seals help determine how reliably it lifts.
Look for drop-forged, alloyed steel or hard cast steel, plus welded bodies sealed inside and out. These materials and construction methods resist deformation and preserve strength through repeated lifting. Check product descriptions for precision welding, sealed connections, and joints designed to keep hydraulic oil contained. Even small seepage can reduce pressure retention and make lifts less reliable.
Prioritize leak-free designs with premium seals, often described as tight-sealing or leak-preventing. Ask whether the manufacturer identifies seal materials or provides replacement parts, since worn seals may need service.
Corrosion-resistant coatings and hydraulic oil can protect metal and sealing surfaces from rust and internal corrosion. If specifications are vague, contact the seller.
Safety and Overload Protection
Choose a 20-ton low-profile bottle jack with a built-in overload or over-travel valve, such as an oil bypass, to help keep pressure within its rated capacity. Check that its safety valves are designed to protect against overloading and unsafe pressure extension; don’t assume the jack’s rating alone provides that safeguard.
Look for leak-resistant seals and welded, pressure-tested construction, since hydraulic leaks can weaken pressure control and compromise protection. A protected bypass system can manage pressure and support stable operation under heavy loads, rather than leaving safety to your technique.
Read the manufacturer’s instructions: if it says not to adjust the safety valve, leave its factory setting untouched. Changing it can defeat the overload protection and expose the hydraulic system to damaging pressure.
Saddle and Vehicle Fit
After checking overload protection, make sure the jack fits both your vehicle and its lifting points.
A serrated, heat-treated saddle should offer enough contact area and grip for the pad or reinforced frame section you’re lifting. Match its shape and position to the vehicle’s point, keeping the load centered to reduce slip risk. Check clearance: the minimum height must let the jack slide beneath the chassis without extension.
Some models start near 6½ inches, while others reach 4.92 inches. Also compare maximum lift height with your job, whether you’re changing a tire, doing brake work, or needing part clearance; low-profile jacks rise to about 11¼ inches or more. Use the screw-top extension only to fine-tune height on uneven ground, not to gain a lift.
Portability and Storage
Portability starts with a compact retracted height: many 20-ton jacks measure about 6.5–7.1 inches tall, while stubby models can fit in even tighter spaces.
Check overall folded dimensions and weight before buying; they determine whether you can lift the jack and tuck it into a trunk or garage. One heavy-duty model weighs about 25.35 pounds and measures roughly 6.7 × 6.4 × 7.56 inches. A built-in carrying handle or side handles can make moving it from shelf to vehicle quicker and safer.
If you’ll keep an extension screw or adjustable pad attached for frequent jobs, account for that extra bulk when packing it away. Finally, choose reinforced packaging for transport, or welded, leak-sealed construction to help prevent hydraulic fluid mess during repeated use and storage.
Frequently Asked Questions
How Should You Safely Position a Bottle Jack Before Lifting a Vehicle?
Park on level ground, engage the parking brake, and chock wheels. Check your vehicle’s manual for the jack point, then center the jack’s saddle beneath it. Never work underneath until you’ve secured your vehicle on rated stands.
What Safety Precautions Should You Follow While a Vehicle Is Supported by a Jack?
You should place rated jack stands under support points, chock the wheels, and work on firm, level ground. Don’t crawl beneath a vehicle held only by a jack, and keep everyone clear while you work.
How Often Should You Inspect and Maintain a Hydraulic Bottle Jack?
Inspect your hydraulic bottle jack before every use, and perform a maintenance check monthly or as its manual directs.
You should check for leaks, damage, smooth operation, and proper fluid levels; replace worn parts promptly.
Can a Bottle Jack Be Used to Support a Vehicle for Extended Periods?
No, don’t use a bottle jack to support your vehicle for extended periods. Raise the vehicle, then place properly rated jack stands beneath approved support points; keep the jack available as backup, not as support.
How Should You Store a Bottle Jack to Prevent Damage or Hydraulic Leaks?
Store your bottle jack upright in a clean, dry place, with the ram retracted and release valve closed. You’ll prevent corrosion and reduce leak risk; keep it away from moisture, dirt, extreme heat, and impacts.
Conclusion
Choose your 20-ton low-profile bottle jack based on the clearance you have, lift range, and whether you want manual or air-assisted operation. Compare the models’ construction, stability, and safety features, too.
Before buying, confirm the jack suits your vehicle and intended use, and check its instructions and maintenance requirements. A well-matched jack can make lifting easier, but it’s never a substitute for properly rated jack stands. Use it on a firm, level surface, and don’t work beneath a load supported only by a jack.
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